You could always enlist the help of a trading assistant to help list and
sell all your items. I am a trading assistant.Turbo lister is good to
prepare multiple listings.Pc/laptop easiest way. Apps on smartphones are
really just good for checking and ...
Remember postage is not just postage. It is postage, packing materials,
your time to go to the post office etc... Also, buyers who are
experienced could advise a seller of a better postage method for the
bought item. Just a thought.